Funding for this research was provided by:
National Health Security Office, Thailand
Received: 14 January 2020
Accepted: 6 February 2020
First Online: 6 March 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee for Human Research, Khon Kaen University (HE 602147).
: Not applicable.
: All authors declare no support from any organization for the submitted work other than National Health Security Office (NHSO). JJ and JT are employees of the NHSO.